Manipulating object attribute key

Use the ceph-objectstore-tool utility to change object attributes.

Before you begin

Before you begin, make sure that you have the following prerequisites in place:
  • Root-level access to the Ceph OSD node.
  • Stop the ceph-osd daemon.

About this task

To manipulate object attributes you need the data paths, the placement group identifier (PG ID), the object, and the key in the object attribute.

Procedure

  1. Verify that the appropriate OSD is down.
    systemctl status ceph-osd@OSD_ID
    For example,
    [root@host01 ~]# systemctl status ceph-osd@1
  2. Log in to the OSD container.
    cephadm shell --name osd.OSD_ID
    For example,
    [root@host01 ~]# cephadm shell --name osd.0
  3. Get the attributes of the object.
    ceph-objectstore-tool --data-path PATH_TO_OSD \
--pgid PG_ID OBJECT \
get-attr KEY > OBJECT_ATTRS_FILE_NAME
    For example,
    [ceph: root@host01 /]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 \
--pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' \
get-attr "oid" > zone_info.default.attr.txt
  4. Set the attributes of the object.
    ceph-objectstore-tool --data-path PATH_TO_OSD \
--pgid PG_ID OBJECT \
set-attr KEY > OBJECT_ATTRS_FILE_NAME
    For example,
    [ceph: root@host01 /]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 \
--pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' \
set-attr "oid" > zone_info.default.attr.txt
  5. Remove the attributes of the object.
    ceph-objectstore-tool --data-path PATH_TO_OSD \
--pgid PG_ID OBJECT  \
rm-attr KEY
    For example,
    [ceph: root@host01 /]# ceph-objectstore-tool --data-path /var/lib/ceph/osd/ceph-0 \
--pgid 0.1c '{"oid":"zone_info.default","key":"","snapid":-2,"hash":235010478,"max":0,"pool":11,"namespace":""}' \
rm-attr "oid"